If there are exactly 2 visible notification appliances in the field of view, must they flash in synchronization?

• A. Yes, they must flash in synchronization
• B. No, synchronization is required only when more than 2
• C. Only if the area is larger than 1000 sq ft
• D. Only for outdoor devices

Answer: (B)

Synchronization of notification appliances is about creating a single, uniform alarm signal across all devices in the same area. The rule recognizes that with a larger number of devices, coordinated timing helps evacuations be clear and unambiguous. When there are only two devices in the area, synchronization is not required, so they do not have to flash in lockstep. If more than two devices are present in the same area, then synchronization is required to avoid a disjointed signal and ensure a uniform alert throughout the space. So with exactly two visible devices, you would not be required to have them flash in synchronization.